Geometrical instruments – Gauge – Collocating
Reexamination Certificate
2000-03-06
2001-07-31
Hirshfeld, Andrew H. (Department: 2859)
Geometrical instruments
Gauge
Collocating
C408S11500B
Reexamination Certificate
active
06266890
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention is a device to assist professionals and do-it-yourself persons in drilling straight or angular holes precisely in exact desired locations. The simplicity of this invention allows skilled or unskilled persons to drill holes accurately, normally and efficiently each and every time without wondering where the drill bit will exit, especially when drilling thick materials.
This invention can be adjusted to drill angular or straight holes accurately. During the drilling operation, all the user needs to do is set the invention for the drill bit diameter and for the angle to be drilled, then hold, clamp, or fasten the invention to the object to be drilled. No special skills are required.
This invention's compact size including only a few parts makes it easy to manufacture with minimal cost. Therefore the invention can be affordable by all persons. The ease of use of the invention guarantees accurately positioned drill holes, which fulfills consumer's needs.
BRIEF SUMMARY OF THE INVENTION
This invention is a low cost consumer oriented tool designed for use by any person, regardless of skill level, to drill holes safely and accurately. This invention completely eliminates the wonder and fear of where the drill bit will exit on the opposite side of the piece being drilled.
This invention's size allows it to be used anywhere a power or manual drilling unit can be utilized. This invention is self adjusting to suit all diameter drill bits and is very easily changed to the desired angle required.
The operational simplicity of this invention involves:
1—inserting the drill bit;
2—turning the drill to the angle required;
3—tightening the locking screw; and
4—drilling the hole.
REFERENCES:
patent: 3086408 (1963-04-01), Donals
patent: 3119286 (1964-01-01), Forman et al.
patent: 3534639 (1970-10-01), Treichler
patent: 4132496 (1979-01-01), Casto
patent: 4199283 (1980-04-01), Perry
patent: 4391558 (1983-07-01), Perry
patent: 815360 (1959-06-01), None
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